@Sidratulmonteher I downloaded a customizable keyboard app called "Kika" which lets you press on the emoji button, scroll to the gifs, and choose the one you like the best. The gifs are also organized by their reaction such as shocked, happy, or frustrated. It should be available to download on Google Play or the Apple Play Store. I hope I helped you out! It is a very popular app, so not to hard to find. :))